Question: In terms of evolutionary trees, what exactly is a node? a group of organisms that are closely related and may or may not be species

In terms of evolutionary trees, what exactly is a node?
a group of organisms that are closely related and may or may not be species
an event that changes a population
the point at which two groups diverge on an evolutionary tree
another word for a common ancestor
a subset of a species
In terms of evolutionary trees, what exactly is a

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